Plating the burgers: Mix beef and butter with salt and form into four patties. Mark on grill on both sides. Slather with BBQ sauce and continue to cook. Melt cheese on top. Don’t press the burger, as you don’t want juice to escape. Take a four roll cluster of buns and slice them in half. Slather bun with mayo. Place burger patty inside, top with lettuce, tomato, onion and pickles, cover with bun and serve.